Retro Studios (Metroid) once worked on a Portal-style game that was rejected by Nintendo
, by Thibaut
Nintendo almost had its own Portal. Indeed, just after the launch of Metroid Prime 3, Retro Studios came up with a new license called Adept.
This was a first-person puzzle game in which you had to use cylinders rather than portals. Here, it was even possible to use as many cylinders as desired to progress and confront enemies.
A prototype had been created for GameCube by Paul Tozour (a programmer on Metroid Prime 2 and 3). Alas, when it was shown to Nintendo's Metroid producer Kensuke Tanabe, he didn't give the go-ahead for the game's creation.
Despite this, Tozour had received an agreement to migrate his project to the Nintendo DS. However, the title didn't work on the handheld console and was therefore abandoned once and for all.
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Source: eurogamer.net